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None of the eight AI code clients tested asks for permission again when an MCP tool's description changes.
Claude Code, Goose and Qwen Code ask no question from the first call in their default configuration.
After the server's notification, Claude Code, VS Code and Cursor IDE fetch the new description without displaying anything.
Gemini CLI is the only client to report the change, with a line: "Tools updated for server".
In these clients, an approval is tied to the tool's name, not to what the tool says it does.